board/karo/common/fdt.c

   1 /*
   2  * (C) Copyright 2012,2013 Lothar Waßmann <LW@KARO-electronics.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16 */
  17
  18 #include <common.h>
  19 #include <errno.h>
  20 #include <libfdt.h>
  21 #include <fdt_support.h>
  22 #include <nand.h>
  23 #include <mxcfb.h>
  24 #include <linux/list.h>
  25 #include <linux/fb.h>
  26 #include <jffs2/load_kernel.h>
  27
  28 #include "karo.h"
  29
  30 #ifdef CONFIG_MAX_DTB_SIZE
  31 #define MAX_DTB_SIZE    CONFIG_MAX_DTB_SIZE
  32 #else
  33 #define MAX_DTB_SIZE    SZ_64K
  34 #endif
  35
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38 static void karo_set_fdtsize(void *fdt)
  39 {
  40         char fdt_size[9];
  41         size_t fdtsize = getenv_ulong("fdtsize", 16, 0);
  42
  43         if (fdtsize == fdt_totalsize(fdt)) {
  44                 return;
  45         }
  46         debug("FDT size changed from %u to %u\n",
  47                 fdtsize, fdt_totalsize(fdt));
  48
  49         snprintf(fdt_size, sizeof(fdt_size), "%08x", fdt_totalsize(fdt));
  50         setenv("fdtsize", fdt_size);
  51 }
  52
  53 void karo_fdt_move_fdt(void)
  54 {
  55         void *fdt;
  56         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
  57
  58         if (working_fdt) {
  59                 debug("DTB already loaded\n");
  60                 return;
  61         }
  62
  63         if (!fdt_addr) {
  64                 fdt_addr = CONFIG_SYS_FDT_ADDR;
  65                 printf("fdtaddr is not set; using default: %08lx\n",
  66                         fdt_addr);
  67         }
  68
  69         fdt = karo_fdt_load_dtb();
  70         if (fdt == NULL) {
  71                 fdt = (void *)gd->fdt_blob;
  72                 if (fdt == NULL) {
  73 #ifdef CONFIG_OF_EMBED
  74                         printf("Compiled in FDT not found\n");
  75 #else
  76                         printf("No FDT found\n");
  77 #endif
  78                         return;
  79                 }
  80                 debug("Checking FDT header @ %p\n", fdt);
  81                 if (fdt_check_header(fdt)) {
  82                         printf("ERROR: No valid DTB found at %p\n", fdt);
  83                         return;
  84                 }
  85                 printf("No DTB in flash; using default DTB\n");
  86                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
  87                         fdt, fdt + fdt_totalsize(fdt) - 1,
  88                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
  89                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
  90         }
  91         set_working_fdt_addr((void *)fdt_addr);
  92         gd->fdt_blob = fdt;
  93         karo_set_fdtsize(fdt);
  94 }
  95
  96 void karo_fdt_remove_node(void *blob, const char *node)
  97 {
  98         int off = fdt_path_offset(blob, node);
  99         int ret;
 100
 101         debug("Removing node '%s' from DT\n", node);
 102
 103         if (off < 0) {
 104                 printf("Could not find node '%s': %d\n", node, off);
 105         } else {
 106                 ret = fdt_del_node(blob, off);
 107                 if (ret)
 108                         printf("Failed to remove node '%s': %d\n",
 109                                 node, ret);
 110         }
 111         karo_set_fdtsize(blob);
 112 }
 113
 114 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 115 {
 116         int off = fdt_path_offset(blob, node);
 117
 118         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 119         if (off < 0) {
 120                 printf("Could not find node '%s': %d\n", node, off);
 121                 return;
 122         }
 123         fdt_set_node_status(blob, off,
 124                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 125
 126         karo_set_fdtsize(blob);
 127 }
 128
 129 static const char *karo_touchpanels[] = {
 130         "ti,tsc2007",
 131         "edt,edt-ft5x06",
 132 #ifdef CONFIG_MX28
 133         "fsl,imx28-lradc",
 134 #endif
 135 };
 136
 137 static void fdt_disable_tp_node(void *blob, const char *name)
 138 {
 139         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 140
 141         if (offs < 0) {
 142                 debug("node '%s' not found: %d\n", name, offs);
 143                 return;
 144         }
 145
 146         debug("Disabling node '%s'\n", name);
 147         fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 148 }
 149
 150 void karo_fdt_fixup_touchpanel(void *blob)
 151 {
 152         int i;
 153         const char *model = getenv("touchpanel");
 154
 155         for (i = 0; i < ARRAY_SIZE(karo_touchpanels); i++) {
 156                 const char *tp = karo_touchpanels[i];
 157
 158                 if (model != NULL && strcmp(model, tp) == 0)
 159                         continue;
 160
 161                 if (model != NULL) {
 162                         if (strcmp(model, tp) == 0)
 163                                 continue;
 164                         tp = strchr(tp, ',');
 165                         if (tp != NULL && *tp != '\0' && strcmp(model, tp + 1) == 0)
 166                                 continue;
 167                 }
 168                 fdt_disable_tp_node(blob, karo_touchpanels[i]);
 169         }
 170         karo_set_fdtsize(blob);
 171 }
 172
 173 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy)
 174 {
 175         const char *otg_mode = getenv("otg_mode");
 176         int off;
 177         int ret;
 178         const uint32_t *ph;
 179         int disable_otg = 0;
 180         int disable_phy_pins = 1;
 181
 182         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 183
 184         off = fdt_path_offset(blob, node);
 185         if (off < 0) {
 186                 debug("Failed to find node %s\n", node);
 187                 return;
 188         }
 189
 190         if (otg_mode && (strcmp(otg_mode, "device") == 0 ||
 191                                 strcmp(otg_mode, "gadget") == 0)) {
 192                 debug("Setting dr_mode to 'peripheral'\n");
 193                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 194         } else if (otg_mode && strcmp(otg_mode, "host") == 0) {
 195                 debug("Setting dr_mode to 'host'\n");
 196                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 197                 disable_phy_pins = 0;
 198         } else if (otg_mode && strcmp(otg_mode, "otg") == 0) {
 199                 debug("Setting dr_mode to 'host'\n");
 200                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 201         } else {
 202                 if (otg_mode && strcmp(otg_mode, "none") != 0)
 203                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 204                                 otg_mode);
 205                 disable_otg = 1;
 206                 ret = 0;
 207         }
 208
 209         if ((!disable_phy_pins && !disable_otg) || ret)
 210                 goto out;
 211
 212         if (disable_otg) {
 213                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 214                 if (ret)
 215                         goto out;
 216         }
 217
 218         ph = fdt_getprop(blob, off, phy, NULL);
 219         if (ph == NULL) {
 220                 printf("Failed to find '%s' phandle in node '%s'\n", phy,
 221                         fdt_get_name(blob, off, NULL));
 222                 goto out;
 223         }
 224
 225         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 226         if (off <= 0) {
 227                 printf("Failed to find '%s' node via phandle %04x\n",
 228                         phy, fdt32_to_cpu(*ph));
 229                 goto out;
 230         }
 231
 232         if (disable_otg) {
 233                 debug("Disabling usbphy\n");
 234                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 235         }
 236 out:
 237         if (ret)
 238                 printf("Failed to update usbotg: %d\n", ret);
 239         else
 240                 debug("node '%s' updated\n", node);
 241         karo_set_fdtsize(blob);
 242 }
 243
 244 static int karo_fdt_flexcan_enabled(void *blob)
 245 {
 246         const char *can_ifs[] = {
 247                 "can0",
 248                 "can1",
 249         };
 250         size_t i;
 251
 252         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 253                 const char *status;
 254                 int off = fdt_path_offset(blob, can_ifs[i]);
 255
 256                 if (off < 0) {
 257                         debug("node '%s' not found\n", can_ifs[i]);
 258                         continue;
 259                 }
 260                 status = fdt_getprop(blob, off, "status", NULL);
 261                 if (status && strcmp(status, "okay") == 0) {
 262                         debug("%s is enabled\n", can_ifs[i]);
 263                         return 1;
 264                 }
 265         }
 266         debug("can driver is disabled\n");
 267         return 0;
 268 }
 269
 270 static void karo_fdt_set_lcd_pins(void *blob, const char *name)
 271 {
 272         int off = fdt_path_offset(blob, name);
 273         u32 ph;
 274         const struct fdt_property *pc;
 275         int len;
 276
 277         if (off < 0)
 278                 return;
 279
 280         ph = fdt_create_phandle(blob, off);
 281         if (!ph)
 282                 return;
 283
 284         off = fdt_path_offset(blob, "display");
 285         if (off < 0)
 286                 return;
 287
 288         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 289         if (!pc || len < sizeof(ph))
 290                 return;
 291
 292         memcpy((void *)pc->data, &ph, sizeof(ph));
 293         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 294 }
 295
 296 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 297 {
 298         const char *xcvr_status = "disabled";
 299
 300         if (xcvr_present) {
 301                 if (karo_fdt_flexcan_enabled(blob)) {
 302                         karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 303                         xcvr_status = "okay";
 304                 } else {
 305                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 306                 }
 307         } else {
 308                 const char *otg_mode = getenv("otg_mode");
 309
 310                 if (otg_mode && (strcmp(otg_mode, "host") == 0))
 311                         karo_fdt_enable_node(blob, "can1", 0);
 312
 313                 karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 314         }
 315         fdt_find_and_setprop(blob, "/regulators/can-xcvr", "status",
 316                         xcvr_status, strlen(xcvr_status) + 1, 1);
 317 }
 318
 319 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 320                         const char *prop)
 321 {
 322         int ret;
 323         int offset;
 324         const uint32_t *phandle;
 325         uint32_t ph = 0;
 326
 327         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 328         if (offset <= 0)
 329                 return;
 330
 331         phandle = fdt_getprop(blob, offset, prop, NULL);
 332         if (phandle) {
 333                 ph = fdt32_to_cpu(*phandle);
 334         }
 335
 336         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 337         ret = fdt_delprop(blob, offset, prop);
 338         if (ret == 0)
 339                 karo_set_fdtsize(blob);
 340
 341         if (!ph)
 342                 return;
 343
 344         offset = fdt_node_offset_by_phandle(blob, ph);
 345         if (offset <= 0)
 346                 return;
 347
 348         debug("Removing node @ %08x\n", offset);
 349         fdt_del_node(blob, offset);
 350         karo_set_fdtsize(blob);
 351 }
 352
 353 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 354 {
 355         const uint32_t *prop;
 356
 357         memset(fb_mode, 0, sizeof(*fb_mode));
 358
 359         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 360         if (prop)
 361                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 362
 363         prop = fdt_getprop(blob, off, "hactive", NULL);
 364         if (prop)
 365                 fb_mode->xres = fdt32_to_cpu(*prop);
 366
 367         prop = fdt_getprop(blob, off, "vactive", NULL);
 368         if (prop)
 369                 fb_mode->yres = fdt32_to_cpu(*prop);
 370
 371         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 372         if (prop)
 373                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 374
 375         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 376         if (prop)
 377                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 378
 379         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 380         if (prop)
 381                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 382
 383         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 384         if (prop)
 385                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 386
 387         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 388         if (prop)
 389                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 390
 391         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 392         if (prop)
 393                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 394
 395         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 396         if (prop)
 397                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 398
 399         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 400         if (prop)
 401                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 402
 403         prop = fdt_getprop(blob, off, "de-active", NULL);
 404         if (prop)
 405                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 406
 407         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 408         if (prop)
 409                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 410
 411         return 0;
 412 }
 413
 414 static int fdt_update_native_fb_mode(void *blob, int off)
 415 {
 416         int ret;
 417         uint32_t ph;
 418
 419         ret = fdt_increase_size(blob, 64);
 420         if (ret) {
 421                 printf("Warning: Failed to increase FDT size: %d\n", ret);
 422         }
 423         debug("Creating phandle at offset %d\n", off);
 424         ph = fdt_create_phandle(blob, off);
 425         if (!ph) {
 426                 printf("Failed to create phandle for video timing\n");
 427                 return -ENOMEM;
 428         }
 429
 430         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 431                 off, ph);
 432         off = fdt_parent_offset(blob, off);
 433         if (off < 0)
 434                 return off;
 435         debug("parent offset=%06x\n", off);
 436         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 437         if (ret)
 438                 printf("Failed to set property 'native-mode': %d\n", ret);
 439         karo_set_fdtsize(blob);
 440         return ret;
 441 }
 442
 443 static int karo_fdt_find_video_timings(void *blob)
 444 {
 445         int off = fdt_path_offset(blob, "display");
 446         const char *subnode = "display-timings";
 447
 448         if (off < 0) {
 449                 debug("Could not find node 'display' in FDT: %d\n", off);
 450                 return off;
 451         }
 452
 453         off = fdt_subnode_offset(blob, off, subnode);
 454         if (off < 0) {
 455                 debug("Could not find node '%s' in FDT: %d\n", subnode, off);
 456         }
 457         return off;
 458 }
 459
 460 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 461 {
 462         int off = karo_fdt_find_video_timings(blob);
 463
 464         if (off < 0)
 465                 return off;
 466         while (off > 0) {
 467                 const char *n, *endp;
 468                 int len, d = 1;
 469
 470                 off = fdt_next_node(blob, off, &d);
 471                 if (off < 0)
 472                         return off;
 473                 if (d < 1)
 474                         return -EINVAL;
 475                 if (d > 2) {
 476                         debug("Skipping node @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 477                         continue;
 478                 }
 479                 debug("parsing subnode @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 480
 481                 n = fdt_getprop(blob, off, "panel-name", &len);
 482                 if (!n) {
 483                         n = fdt_get_name(blob, off, NULL);
 484                         if (strcasecmp(n, name) == 0) {
 485                                 break;
 486                         }
 487                 } else {
 488                         int found = 0;
 489
 490                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 491                                 debug("Checking panel-name '%s'\n", n);
 492                                 if (strcasecmp(n, name) == 0) {
 493                                         debug("Using node %s @ %04x\n",
 494                                                 fdt_get_name(blob, off, NULL), off);
 495                                         found = 1;
 496                                         break;
 497                                 }
 498                         }
 499                         if (found)
 500                                 break;
 501                 }
 502         }
 503         if (off > 0) {
 504                 return fdt_init_fb_mode(blob, off, fb_mode);
 505         }
 506         return -EINVAL;
 507 }
 508
 509 #define SET_FB_PROP(n, v) ({                                            \
 510         int ret;                                                        \
 511         ret = fdt_setprop_u32(blob, off, n, v);                         \
 512         if (ret) {                                                      \
 513                 printf("Failed to set property %s: %d\n", name, ret);   \
 514         }                                                               \
 515         ret;                                                            \
 516 })
 517
 518
 519 int karo_fdt_create_fb_mode(void *blob, const char *name,
 520                         struct fb_videomode *fb_mode)
 521 {
 522         int off = fdt_path_offset(blob, "display");
 523         int ret;
 524         const char *subnode = "display-timings";
 525
 526         if (off < 0) {
 527                 printf("'display' node not found in FDT\n");
 528                 return off;
 529         }
 530
 531         ret = fdt_increase_size(blob, 512);
 532         if (ret) {
 533                 printf("Failed to increase FDT size: %d\n", ret);
 534                 return ret;
 535         }
 536
 537         printf("node '%s' offset=%d\n", "display", off);
 538         ret = fdt_subnode_offset(blob, off, subnode);
 539         if (ret < 0) {
 540                 debug("Could not find node '%s' in FDT: %d\n", subnode, ret);
 541                 ret = fdt_add_subnode(blob, off, subnode);
 542                 if (ret < 0) {
 543                         printf("Failed to add %s subnode: %d\n", subnode, ret);
 544                         return ret;
 545                 }
 546         }
 547
 548         printf("node '%s' offset=%d\n", subnode, ret);
 549         ret = fdt_add_subnode(blob, ret, name);
 550         if (ret < 0) {
 551                 printf("Failed to add %s subnode: %d\n", name, ret);
 552                 return ret;
 553         }
 554         off = ret;
 555
 556         ret = SET_FB_PROP("clock-frequency",
 557                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 558         if (ret)
 559                 goto out;
 560         ret = SET_FB_PROP("hactive", fb_mode->xres);
 561         if (ret)
 562                 goto out;
 563         ret = SET_FB_PROP("vactive", fb_mode->yres);
 564         if (ret)
 565                 goto out;
 566         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 567         if (ret)
 568                 goto out;
 569         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 570         if (ret)
 571                 goto out;
 572         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 573         if (ret)
 574                 goto out;
 575         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 576         if (ret)
 577                 goto out;
 578         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 579         if (ret)
 580                 goto out;
 581         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 582         if (ret)
 583                 goto out;
 584         ret = SET_FB_PROP("hsync-active",
 585                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 586         if (ret)
 587                 goto out;
 588         ret = SET_FB_PROP("vsync-active",
 589                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 590         if (ret)
 591                 goto out;
 592         ret = SET_FB_PROP("de-active",
 593                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 594         if (ret)
 595                 goto out;
 596         ret = SET_FB_PROP("pixelclk-active",
 597                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 598 out:
 599         karo_set_fdtsize(blob);
 600         return ret;
 601 }
 602
 603 char *karo_fdt_set_display(char *video_mode, const char *lcd_path,
 604                         const char *lvds_path)
 605 {
 606         char *vm;
 607         int ret;
 608         int off;
 609         void *blob = (void *)gd->fdt_blob;
 610
 611         if (video_mode == NULL)
 612                 return NULL;
 613
 614         off = fdt_path_offset(blob, "/aliases");
 615         ret = fdt_resize(blob);
 616         if (ret < 0) {
 617                 printf("%s: Failed to resize FDT: %s\n",
 618                         __func__, fdt_strerror(ret));
 619         }
 620         vm = strsep(&video_mode, ":");
 621         if (off < 0) {
 622                 off = fdt_add_subnode(blob, off, "aliases");
 623                 if (off < 0) {
 624                         printf("%s: Failed to create 'aliases' node: %s\n",
 625                                 __func__, fdt_strerror(off));
 626                         return video_mode ?: vm;
 627                 }
 628         }
 629         if (video_mode != NULL) {
 630                 char display[strlen(lvds_path) + sizeof("/lvds-channel@x")];
 631
 632                 strncpy(display, lvds_path, sizeof(display));
 633                 if (strcmp(vm, "LVDS") == 0 ||
 634                         strcmp(vm, "LVDS0") == 0) {
 635                         strncat(display, "/lvds-channel@0", sizeof(display));
 636                 } else if (strcmp(vm, "LVDS1") == 0) {
 637                         strncat(display, "/lvds-channel@1", sizeof(display));
 638                 } else {
 639                         printf("%s: Syntax error in video_mode\n",
 640                                 __func__);
 641                         return video_mode;
 642                 }
 643                 ret = fdt_setprop_string(blob, off, "display", display);
 644                 debug("setprop_string(display='%s') returned %d\n", display, ret);
 645         } else {
 646                 char display[strlen(lcd_path) + sizeof("/display@di0")];
 647
 648                 snprintf(display, sizeof(display), "%s/display@di0", lcd_path);
 649
 650                 ret = fdt_setprop_string(blob, off, "display",
 651                                         display);
 652
 653                 off = fdt_path_offset(blob, "lvds0");
 654                 if (off >= 0) {
 655                         ret = fdt_set_node_status(blob, off,
 656                                                 FDT_STATUS_DISABLED, 0);
 657                 }
 658                 off = fdt_path_offset(blob, "lvds1");
 659                 if (off >= 0) {
 660                         ret = fdt_set_node_status(blob, off,
 661                                                 FDT_STATUS_DISABLED, 0);
 662                 }
 663                 video_mode = vm;
 664         }
 665         if (ret) {
 666                 printf("%s: failed to set 'display' alias: %s\n",
 667                         __func__, fdt_strerror(ret));
 668         }
 669         return video_mode;
 670 }
 671
 672 int karo_fdt_update_fb_mode(void *blob, const char *name)
 673 {
 674         int off = fdt_path_offset(blob, "display");
 675         const char *subnode = "display-timings";
 676
 677         if (off < 0)
 678                 return off;
 679
 680         if (name == NULL) {
 681                 int ret;
 682
 683                 debug("Disabling node '%s' at %03x\n",
 684                         fdt_get_name(blob, off, NULL), off);
 685                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 686                 return ret;
 687         }
 688
 689         off = fdt_subnode_offset(blob, off, subnode);
 690         if (off < 0) {
 691                 debug("Could not find node '%s' in FDT: %d\n", subnode, off);
 692                 return off;
 693         }
 694         while (off > 0) {
 695                 const char *n, *endp;
 696                 int len, d = 1;
 697
 698                 off = fdt_next_node(blob, off, &d);
 699                 if (off < 0)
 700                         return off;
 701                 if (d < 1)
 702                         return -EINVAL;
 703                 if (d > 2) {
 704                         debug("Skipping node @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 705                         continue;
 706                 }
 707                 debug("parsing subnode @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 708
 709                 n = fdt_getprop(blob, off, "panel-name", &len);
 710                 if (!n) {
 711                         n = fdt_get_name(blob, off, NULL);
 712                         if (strcasecmp(n, name) == 0) {
 713                                 break;
 714                         }
 715                 } else {
 716                         int found = 0;
 717
 718                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 719                                 debug("Checking panel-name '%s'\n", n);
 720                                 if (strcasecmp(n, name) == 0) {
 721                                         debug("Using node %s @ %04x\n",
 722                                                 fdt_get_name(blob, off, NULL), off);
 723                                         found = 1;
 724                                         break;
 725                                 }
 726                         }
 727                         if (found)
 728                                 break;
 729                 }
 730         }
 731         if (off > 0)
 732                 return fdt_update_native_fb_mode(blob, off);
 733         return off;
 734 }
 735
 736 static int karo_load_part(const char *part, void *addr, size_t len)
 737 {
 738         int ret;
 739         struct mtd_device *dev;
 740         struct part_info *part_info;
 741         u8 part_num;
 742         size_t actual;
 743
 744         debug("Initializing mtd_parts\n");
 745         ret = mtdparts_init();
 746         if (ret)
 747                 return ret;
 748
 749         debug("Trying to find NAND partition '%s'\n", part);
 750         ret = find_dev_and_part(part, &dev, &part_num, &part_info);
 751         if (ret) {
 752                 printf("Failed to find flash partition '%s': %d\n",
 753                         part, ret);
 754
 755                 return ret;
 756         }
 757         debug("Found partition '%s': offset=%08x size=%08x\n",
 758                 part, part_info->offset, part_info->size);
 759         if (part_info->size < len) {
 760                 printf("Warning: partition '%s' smaller than requested size: %u; truncating data to %u byte\n",
 761                         part, len, part_info->size);
 762                 len = part_info->size;
 763         }
 764         debug("Reading NAND partition '%s' to %p\n", part, addr);
 765         ret = nand_read_skip_bad(&nand_info[0], part_info->offset, &len,
 766                                 &actual, len, addr);
 767         if (ret) {
 768                 printf("Failed to load partition '%s' to %p\n", part, addr);
 769                 return ret;
 770         }
 771         if (actual < len)
 772                 printf("Read only %u of %u bytes due to bad blocks\n",
 773                         actual, len);
 774
 775         debug("Read %u byte from partition '%s' @ offset %08x\n",
 776                 len, part, part_info->offset);
 777         return 0;
 778 }
 779
 780 void *karo_fdt_load_dtb(void)
 781 {
 782         int ret;
 783         void *fdt = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
 784
 785         if (tstc()) {
 786                 debug("aborting DTB load\n");
 787                 return NULL;
 788         }
 789
 790         /* clear FDT header in memory */
 791         memset(fdt, 0, 4);
 792
 793         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
 794         if (ret) {
 795                 printf("Failed to load dtb from flash: %d\n", ret);
 796                 return NULL;
 797         }
 798
 799         if (fdt_check_header(fdt)) {
 800                 debug("No valid DTB in flash\n");
 801                 return NULL;
 802         }
 803         debug("Using DTB from flash\n");
 804         karo_set_fdtsize(fdt);
 805         return fdt;
 806 }